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<a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a name="2" href="#2">2</a>   <em class="jxr_comment"> *  Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a name="3" href="#3">3</a>   <em class="jxr_comment"> *  contributor license agreements.  See the NOTICE file distributed with</em>
<a name="4" href="#4">4</a>   <em class="jxr_comment"> *  this work for additional information regarding copyright ownership.</em>
<a name="5" href="#5">5</a>   <em class="jxr_comment"> *  The ASF licenses this file to You under the Apache License, Version 2.0</em>
<a name="6" href="#6">6</a>   <em class="jxr_comment"> *  (the "License"); you may not use this file except in compliance with</em>
<a name="7" href="#7">7</a>   <em class="jxr_comment"> *  the License.  You may obtain a copy of the License at</em>
<a name="8" href="#8">8</a>   <em class="jxr_comment"> *</em>
<a name="9" href="#9">9</a>   <em class="jxr_comment"> *     <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="10" href="#10">10</a>  <em class="jxr_comment"> *</em>
<a name="11" href="#11">11</a>  <em class="jxr_comment"> *  Unless required by applicable law or agreed to in writing, software</em>
<a name="12" href="#12">12</a>  <em class="jxr_comment"> *  distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="13" href="#13">13</a>  <em class="jxr_comment"> *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="14" href="#14">14</a>  <em class="jxr_comment"> *  See the License for the specific language governing permissions and</em>
<a name="15" href="#15">15</a>  <em class="jxr_comment"> *  limitations under the License.</em>
<a name="16" href="#16">16</a>  <em class="jxr_comment"> */</em>
<a name="17" href="#17">17</a>  
<a name="18" href="#18">18</a>  <strong class="jxr_keyword">package</strong> java.net;
<a name="19" href="#19">19</a>  
<a name="20" href="#20">20</a>  
<a name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.io.ByteArrayOutputStream;
<a name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.io.UnsupportedEncodingException;
<a name="23" href="#23">23</a>  
<a name="24" href="#24">24</a>  <em class="jxr_javadoccomment">/**</em>
<a name="25" href="#25">25</a>  <em class="jxr_javadoccomment"> * This class is used to encode a string using the format required by</em>
<a name="26" href="#26">26</a>  <em class="jxr_javadoccomment"> * &lt;code&gt;application/x-www-form-urlencoded&lt;/code&gt; MIME content type.</em>
<a name="27" href="#27">27</a>  <em class="jxr_javadoccomment"> * </em>
<a name="28" href="#28">28</a>  <em class="jxr_javadoccomment"> * It contains helper methods used by the URI class, and performs encoding and</em>
<a name="29" href="#29">29</a>  <em class="jxr_javadoccomment"> * decoding in a slightly different way than URLEncoder and URLDecoder.</em>
<a name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> */</em>
<a name="31" href="#31">31</a>  <strong class="jxr_keyword">class</strong> <a href="../../java/net/URIEncoderDecoder.html">URIEncoderDecoder</a> {
<a name="32" href="#32">32</a>  
<a name="33" href="#33">33</a>  	<strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String digits = <span class="jxr_string">"0123456789ABCDEF"</span>;
<a name="34" href="#34">34</a>  
<a name="35" href="#35">35</a>  	<strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String encoding = <span class="jxr_string">"UTF8"</span>;
<a name="36" href="#36">36</a>  
<a name="37" href="#37">37</a>  	<em class="jxr_javadoccomment">/**</em>
<a name="38" href="#38">38</a>  <em class="jxr_javadoccomment">	 * Validate a string by checking if it contains any characters other than:</em>
<a name="39" href="#39">39</a>  <em class="jxr_javadoccomment">	 * </em>
<a name="40" href="#40">40</a>  <em class="jxr_javadoccomment">	 * 1. letters ('a'..'z', 'A'..'Z') 2. numbers ('0'..'9') 3. characters in</em>
<a name="41" href="#41">41</a>  <em class="jxr_javadoccomment">	 * the legalset parameter 4. others (Unicode characters that are not in</em>
<a name="42" href="#42">42</a>  <em class="jxr_javadoccomment">	 * US-ASCII set, and are not ISO Control or are not ISO Space characters)</em>
<a name="43" href="#43">43</a>  <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="44" href="#44">44</a>  <em class="jxr_javadoccomment">	 * called from URI.Helper.parseURI() to validate each component</em>
<a name="45" href="#45">45</a>  <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="46" href="#46">46</a>  <em class="jxr_javadoccomment">	 * </em>
<a name="47" href="#47">47</a>  <em class="jxr_javadoccomment">	 * @param s</em>
<a name="48" href="#48">48</a>  <em class="jxr_javadoccomment">	 *            java.lang.String the string to be validated</em>
<a name="49" href="#49">49</a>  <em class="jxr_javadoccomment">	 * @param legal</em>
<a name="50" href="#50">50</a>  <em class="jxr_javadoccomment">	 *            java.lang.String the characters allowed in the String s</em>
<a name="51" href="#51">51</a>  <em class="jxr_javadoccomment">	 * </em>
<a name="52" href="#52">52</a>  <em class="jxr_javadoccomment">	 */</em>
<a name="53" href="#53">53</a>  	<strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> validate(String s, String legal) <strong class="jxr_keyword">throws</strong> URISyntaxException {
<a name="54" href="#54">54</a>  		<strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; s.length();) {
<a name="55" href="#55">55</a>  			<strong class="jxr_keyword">char</strong> ch = s.charAt(i);
<a name="56" href="#56">56</a>  			<strong class="jxr_keyword">if</strong> (ch == '%') {
<a name="57" href="#57">57</a>  				<strong class="jxr_keyword">do</strong> {
<a name="58" href="#58">58</a>  					<strong class="jxr_keyword">if</strong> (i + 2 &gt;= s.length()) {
<a name="59" href="#59">59</a>  						<strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../java/net/URISyntaxException.html">URISyntaxException</a>(s, <span class="jxr_string">"K0313"</span>,
<a name="60" href="#60">60</a>  								i);
<a name="61" href="#61">61</a>  					}
<a name="62" href="#62">62</a>  					<strong class="jxr_keyword">int</strong> d1 = Character.digit(s.charAt(i + 1), 16);
<a name="63" href="#63">63</a>  					<strong class="jxr_keyword">int</strong> d2 = Character.digit(s.charAt(i + 2), 16);
<a name="64" href="#64">64</a>  					<strong class="jxr_keyword">if</strong> (d1 == -1 || d2 == -1) {
<a name="65" href="#65">65</a>  						<strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../java/net/URISyntaxException.html">URISyntaxException</a>(s, s.substring(i, i + 3), i);
<a name="66" href="#66">66</a>  					}
<a name="67" href="#67">67</a>  
<a name="68" href="#68">68</a>  					i += 3;
<a name="69" href="#69">69</a>  				} <strong class="jxr_keyword">while</strong> (i &lt; s.length() &amp;&amp; s.charAt(i) == '%');
<a name="70" href="#70">70</a>  
<a name="71" href="#71">71</a>  				<strong class="jxr_keyword">continue</strong>;
<a name="72" href="#72">72</a>  			}
<a name="73" href="#73">73</a>  			<strong class="jxr_keyword">if</strong> (!((ch &gt;= 'a' &amp;&amp; ch &lt;= 'z') || (ch &gt;= 'A' &amp;&amp; ch &lt;= 'Z')
<a name="74" href="#74">74</a>  					|| (ch &gt;= '0' &amp;&amp; ch &lt;= '9') || legal.indexOf(ch) &gt; -1 || (ch &gt; 127
<a name="75" href="#75">75</a>  					&amp;&amp; !Character.isSpace(ch)))) {
<a name="76" href="#76">76</a>  				<strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../java/net/URISyntaxException.html">URISyntaxException</a>(s, <span class="jxr_string">"K00c1"</span>, i);
<a name="77" href="#77">77</a>  			}
<a name="78" href="#78">78</a>  			i++;
<a name="79" href="#79">79</a>  		}
<a name="80" href="#80">80</a>  	}
<a name="81" href="#81">81</a>  
<a name="82" href="#82">82</a>  	<strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> validateSimple(String s, String legal)
<a name="83" href="#83">83</a>  			<strong class="jxr_keyword">throws</strong> <a href="../../java/net/URISyntaxException.html">URISyntaxException</a> {
<a name="84" href="#84">84</a>  		<strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; s.length();) {
<a name="85" href="#85">85</a>  			<strong class="jxr_keyword">char</strong> ch = s.charAt(i);
<a name="86" href="#86">86</a>  			<strong class="jxr_keyword">if</strong> (!((ch &gt;= 'a' &amp;&amp; ch &lt;= 'z') || (ch &gt;= 'A' &amp;&amp; ch &lt;= 'Z')
<a name="87" href="#87">87</a>  					|| (ch &gt;= '0' &amp;&amp; ch &lt;= '9') || legal.indexOf(ch) &gt; -1)) {
<a name="88" href="#88">88</a>  				<strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../java/net/URISyntaxException.html">URISyntaxException</a>(s, <span class="jxr_string">"K00c1"</span>, i);
<a name="89" href="#89">89</a>  			}
<a name="90" href="#90">90</a>  			i++;
<a name="91" href="#91">91</a>  		}
<a name="92" href="#92">92</a>  	}
<a name="93" href="#93">93</a>  
<a name="94" href="#94">94</a>  	<em class="jxr_javadoccomment">/**</em>
<a name="95" href="#95">95</a>  <em class="jxr_javadoccomment">	 * All characters except letters ('a'..'z', 'A'..'Z') and numbers ('0'..'9')</em>
<a name="96" href="#96">96</a>  <em class="jxr_javadoccomment">	 * and legal characters are converted into their hexidecimal value prepended</em>
<a name="97" href="#97">97</a>  <em class="jxr_javadoccomment">	 * by '%'.</em>
<a name="98" href="#98">98</a>  <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="99" href="#99">99</a>  <em class="jxr_javadoccomment">	 * For example: '#' -&gt; %23</em>
<a name="100" href="#100">100</a> <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="101" href="#101">101</a> <em class="jxr_javadoccomment">	 * Other characters, which are Unicode chars that are not US-ASCII, and are</em>
<a name="102" href="#102">102</a> <em class="jxr_javadoccomment">	 * not ISO Control or are not ISO Space chars, are preserved.</em>
<a name="103" href="#103">103</a> <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="104" href="#104">104</a> <em class="jxr_javadoccomment">	 * Called from URI.quoteComponent() (for multiple argument constructors)</em>
<a name="105" href="#105">105</a> <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="106" href="#106">106</a> <em class="jxr_javadoccomment">	 * </em>
<a name="107" href="#107">107</a> <em class="jxr_javadoccomment">	 * @param s</em>
<a name="108" href="#108">108</a> <em class="jxr_javadoccomment">	 *            java.lang.String the string to be converted</em>
<a name="109" href="#109">109</a> <em class="jxr_javadoccomment">	 * @param legal</em>
<a name="110" href="#110">110</a> <em class="jxr_javadoccomment">	 *            java.lang.String the characters allowed to be preserved in the</em>
<a name="111" href="#111">111</a> <em class="jxr_javadoccomment">	 *            string s</em>
<a name="112" href="#112">112</a> <em class="jxr_javadoccomment">	 * @return java.lang.String the converted string</em>
<a name="113" href="#113">113</a> <em class="jxr_javadoccomment">	 */</em>
<a name="114" href="#114">114</a> 	<strong class="jxr_keyword">static</strong> String quoteIllegal(String s, String legal)
<a name="115" href="#115">115</a> 			<strong class="jxr_keyword">throws</strong> UnsupportedEncodingException {
<a name="116" href="#116">116</a> 		StringBuffer buf = <strong class="jxr_keyword">new</strong> StringBuffer();
<a name="117" href="#117">117</a> 		<strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; s.length(); i++) {
<a name="118" href="#118">118</a> 			<strong class="jxr_keyword">char</strong> ch = s.charAt(i);
<a name="119" href="#119">119</a> 			<strong class="jxr_keyword">if</strong> ((ch &gt;= 'a' &amp;&amp; ch &lt;= 'z')
<a name="120" href="#120">120</a> 					|| (ch &gt;= 'A' &amp;&amp; ch &lt;= 'Z')
<a name="121" href="#121">121</a> 					|| (ch &gt;= '0' &amp;&amp; ch &lt;= '9')
<a name="122" href="#122">122</a> 					|| legal.indexOf(ch) &gt; -1
<a name="123" href="#123">123</a> 					|| (ch &gt; 127 &amp;&amp; !Character.isSpace(ch))) {
<a name="124" href="#124">124</a> 				buf.append(ch);
<a name="125" href="#125">125</a> 			} <strong class="jxr_keyword">else</strong> {
<a name="126" href="#126">126</a> 				byte[] bytes = <strong class="jxr_keyword">new</strong> byte[1];
<a name="127" href="#127">127</a>                 bytes[0] = (byte)ch;
<a name="128" href="#128">128</a>                 <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> j = 0; j &lt; bytes.length; j++) {
<a name="129" href="#129">129</a> 					buf.append('%');
<a name="130" href="#130">130</a> 					buf.append(digits.charAt((bytes[j] &amp; 0xf0) &gt;&gt; 4));
<a name="131" href="#131">131</a> 					buf.append(digits.charAt(bytes[j] &amp; 0xf));
<a name="132" href="#132">132</a> 				}
<a name="133" href="#133">133</a> 			}
<a name="134" href="#134">134</a> 		}
<a name="135" href="#135">135</a> 		<strong class="jxr_keyword">return</strong> buf.toString();
<a name="136" href="#136">136</a> 	}
<a name="137" href="#137">137</a> 
<a name="138" href="#138">138</a> 	<em class="jxr_javadoccomment">/**</em>
<a name="139" href="#139">139</a> <em class="jxr_javadoccomment">	 * Other characters, which are Unicode chars that are not US-ASCII, and are</em>
<a name="140" href="#140">140</a> <em class="jxr_javadoccomment">	 * not ISO Control or are not ISO Space chars are not preserved. They are</em>
<a name="141" href="#141">141</a> <em class="jxr_javadoccomment">	 * converted into their hexidecimal value prepended by '%'.</em>
<a name="142" href="#142">142</a> <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="143" href="#143">143</a> <em class="jxr_javadoccomment">	 * For example: Euro currency symbol -&gt; "%E2%82%AC".</em>
<a name="144" href="#144">144</a> <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="145" href="#145">145</a> <em class="jxr_javadoccomment">	 * Called from URI.toASCIIString()</em>
<a name="146" href="#146">146</a> <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="147" href="#147">147</a> <em class="jxr_javadoccomment">	 * </em>
<a name="148" href="#148">148</a> <em class="jxr_javadoccomment">	 * @param s</em>
<a name="149" href="#149">149</a> <em class="jxr_javadoccomment">	 *            java.lang.String the string to be converted</em>
<a name="150" href="#150">150</a> <em class="jxr_javadoccomment">	 * @return java.lang.String the converted string</em>
<a name="151" href="#151">151</a> <em class="jxr_javadoccomment">	 */</em>
<a name="152" href="#152">152</a> 	<strong class="jxr_keyword">static</strong> String encodeOthers(String s) <strong class="jxr_keyword">throws</strong> UnsupportedEncodingException {
<a name="153" href="#153">153</a> 		StringBuffer buf = <strong class="jxr_keyword">new</strong> StringBuffer();
<a name="154" href="#154">154</a> 		<strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; s.length(); i++) {
<a name="155" href="#155">155</a> 			<strong class="jxr_keyword">char</strong> ch = s.charAt(i);
<a name="156" href="#156">156</a> 			<strong class="jxr_keyword">if</strong> (ch &lt;= 127)
<a name="157" href="#157">157</a> 				buf.append(ch);
<a name="158" href="#158">158</a> 			<strong class="jxr_keyword">else</strong> {
<a name="159" href="#159">159</a> 				byte[] bytes = <strong class="jxr_keyword">new</strong> byte[1];
<a name="160" href="#160">160</a>                 bytes[0] = (byte)ch;
<a name="161" href="#161">161</a>                 <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> j = 0; j &lt; bytes.length; j++) {
<a name="162" href="#162">162</a> 					buf.append('%');
<a name="163" href="#163">163</a> 					buf.append(digits.charAt((bytes[j] &amp; 0xf0) &gt;&gt; 4));
<a name="164" href="#164">164</a> 					buf.append(digits.charAt(bytes[j] &amp; 0xf));
<a name="165" href="#165">165</a> 				}
<a name="166" href="#166">166</a> 			}
<a name="167" href="#167">167</a> 		}
<a name="168" href="#168">168</a> 		<strong class="jxr_keyword">return</strong> buf.toString();
<a name="169" href="#169">169</a> 	}
<a name="170" href="#170">170</a> 
<a name="171" href="#171">171</a> 	<em class="jxr_javadoccomment">/**</em>
<a name="172" href="#172">172</a> <em class="jxr_javadoccomment">	 * Decodes the string argument which is assumed to be encoded in the</em>
<a name="173" href="#173">173</a> <em class="jxr_javadoccomment">	 * &lt;code&gt;x-www-form-urlencoded&lt;/code&gt; MIME content type using the UTF-8</em>
<a name="174" href="#174">174</a> <em class="jxr_javadoccomment">	 * encoding scheme.</em>
<a name="175" href="#175">175</a> <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="176" href="#176">176</a> <em class="jxr_javadoccomment">	 * '%' and two following hex digit characters are converted to the</em>
<a name="177" href="#177">177</a> <em class="jxr_javadoccomment">	 * equivalent byte value. All other characters are passed through</em>
<a name="178" href="#178">178</a> <em class="jxr_javadoccomment">	 * unmodified.</em>
<a name="179" href="#179">179</a> <em class="jxr_javadoccomment">	 * </em>
<a name="180" href="#180">180</a> <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="181" href="#181">181</a> <em class="jxr_javadoccomment">	 * e.g. "A%20B%20C %24%25" -&gt; "A B C $%"</em>
<a name="182" href="#182">182</a> <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="183" href="#183">183</a> <em class="jxr_javadoccomment">	 * Called from URI.getXYZ() methods</em>
<a name="184" href="#184">184</a> <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="185" href="#185">185</a> <em class="jxr_javadoccomment">	 * </em>
<a name="186" href="#186">186</a> <em class="jxr_javadoccomment">	 * @param s</em>
<a name="187" href="#187">187</a> <em class="jxr_javadoccomment">	 *            java.lang.String The encoded string.</em>
<a name="188" href="#188">188</a> <em class="jxr_javadoccomment">	 * @return java.lang.String The decoded version.</em>
<a name="189" href="#189">189</a> <em class="jxr_javadoccomment">	 */</em>
<a name="190" href="#190">190</a> 	<strong class="jxr_keyword">static</strong> String decode(String s) <strong class="jxr_keyword">throws</strong> UnsupportedEncodingException {
<a name="191" href="#191">191</a> 
<a name="192" href="#192">192</a> 		StringBuffer result = <strong class="jxr_keyword">new</strong> StringBuffer();
<a name="193" href="#193">193</a> 		ByteArrayOutputStream out = <strong class="jxr_keyword">new</strong> ByteArrayOutputStream();
<a name="194" href="#194">194</a> 		<strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; s.length();) {
<a name="195" href="#195">195</a> 			<strong class="jxr_keyword">char</strong> c = s.charAt(i);
<a name="196" href="#196">196</a> 			<strong class="jxr_keyword">if</strong> (c == '%') {
<a name="197" href="#197">197</a> 				out.reset();
<a name="198" href="#198">198</a> 				<strong class="jxr_keyword">do</strong> {
<a name="199" href="#199">199</a> 					<strong class="jxr_keyword">if</strong> (i + 2 &gt;= s.length())
<a name="200" href="#200">200</a> 						<strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"K01fe: "</span> + i);
<a name="201" href="#201">201</a> 					<strong class="jxr_keyword">int</strong> d1 = Character.digit(s.charAt(i + 1), 16);
<a name="202" href="#202">202</a> 					<strong class="jxr_keyword">int</strong> d2 = Character.digit(s.charAt(i + 2), 16);
<a name="203" href="#203">203</a> 					<strong class="jxr_keyword">if</strong> (d1 == -1 || d2 == -1)
<a name="204" href="#204">204</a> 						<strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException();
<a name="205" href="#205">205</a> 					out.write((byte) ((d1 &lt;&lt; 4) + d2));
<a name="206" href="#206">206</a> 					i += 3;
<a name="207" href="#207">207</a> 				} <strong class="jxr_keyword">while</strong> (i &lt; s.length() &amp;&amp; s.charAt(i) == '%');
<a name="208" href="#208">208</a> 				result.append(out.toString(encoding));
<a name="209" href="#209">209</a> 				<strong class="jxr_keyword">continue</strong>;
<a name="210" href="#210">210</a> 			}
<a name="211" href="#211">211</a> 			result.append(c);
<a name="212" href="#212">212</a> 			i++;
<a name="213" href="#213">213</a> 		}
<a name="214" href="#214">214</a> 		<strong class="jxr_keyword">return</strong> result.toString();
<a name="215" href="#215">215</a> 	}
<a name="216" href="#216">216</a> 
<a name="217" href="#217">217</a> }
</pre>
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